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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6acdef5c9b6b6de7652764bc5eee11674965883c510d8c51f3c2817d70b37d3d' 
  AND token = '6JpvKM+5DYbeAsND4OsebvyanXgQUgV6Xkwch2jGr90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}